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Class Information
Number: 137/493.1
Name: Fluid handling > Line condition change responsive valves > Bi-directional flow valves > One head and seat carried by head of another
Description: Apparatus wherein one valve head carries the head and seat of a second valve.










Sub-classes under this class:

Class Number Class Name Patents
137/493.6 Both valves spring biased 76
137/493.2 Supporting valve only spring biased 40
137/493.3 Supporting valve spring carried by supporting valve 61


Patents under this class:

Patent Number Title Of Patent Date Issued
8469089 Process and apparatus to improve reliability of pinpoint stimulation operations Jun. 25, 2013
8286658 Roll-over valve with shared overfill protection and vacuum relief Oct. 16, 2012
7481320 Filter device having a bi-directional valve Jan. 27, 2009
7320334 Valve Assembly Jan. 22, 2008
7243676 Combination umbrella and inverted bi-directional valve Jul. 17, 2007
7104277 Valve for controlling a tank internal gas pressure Sep. 12, 2006
7044150 Combination vent/check valve assembly May. 16, 2006
6986357 Method of designing a fuel vapor pressure management apparatus Jan. 17, 2006
6874999 Micropumps with passive check valves Apr. 5, 2005
6779546 Pressure control valve for fuel tank Aug. 24, 2004
6779545 Pressure control valve for fuel tank Aug. 24, 2004
6726059 Quick release trigger valve and blast aerator Apr. 27, 2004
6648010 Check valve plate with anti-pressure surge device Nov. 18, 2003
6543474 Pressure equalizing check valve Apr. 8, 2003
6378552 Dual speed flow control valve Apr. 30, 2002
6026848 Pressure relief valve Feb. 22, 2000
5941391 Vacuum storage system Aug. 24, 1999
5725016 Pressure compensating valve for a fuel tank Mar. 10, 1998
5540347 Vent valve assembly for a fuel tank filler neck cap Jul. 30, 1996
5500663 Recording ink container with an air vent valve Mar. 19, 1996
5249598 Bi-directional vent and overpressure relief valve Oct. 5, 1993
5105848 Automatic relief valve Apr. 21, 1992
5033504 Automatic relief valve Jul. 23, 1991
5002088 Clean-in-place pressure and vacuum relief valve Mar. 26, 1991
4507925 Method for and thermal energy injection withdrawal system for aquifers Apr. 2, 1985
4351356 Pressure control valve Sep. 28, 1982
4323096 Combination vacuum relief valve and pressure relief valve which are protected from the atmosphere Apr. 6, 1982
4180066 Safety interface and valve for anesthesia gas scavenging Dec. 25, 1979
4125126 Pressure and vacuum relief valve Nov. 14, 1978
4060155 Hydraulic shock absorber Nov. 29, 1977
4057177 Valved squeeze bottle for viscous products Nov. 8, 1977
4023415 Pressure monitoring device May. 17, 1977
3941149 Valve Mar. 2, 1976











 
 
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